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Unlike 08 numbers, 03 numbers cost the same to call as geographic landline numbers (starting 01 and 02), even from a mobile phone. They are also included as part of inclusive call minutes and discount schemes from all major mobile phone and landline operators.
Last weekend Microsoft updated their adCentre system adding extra functionality to their billing processes including:
Microsoft also claim that the process for adding new credit cards has been streamlined making it even easier to give them some money.